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20/10/2018

Types of Conductor

Solid
conductors

The cross –
section of the solid conductors are small because it is very difficult to
handle it due to higher weight. It may break at the some point due to wind
pressure in long span. ( Span is defined as the distance between two towers ).

Stranded
conductors

The stranded
conductors are used in the transmission line.

Number of
conductors in the stranded conductor

N = 3n ( n + 1 )
+ 1

Where n = Number
of layers

n = 0, N = 1

n = 1, N = 7

n = 2,
N = 19

n = 3, N = 37

Diameter of
conductor D = ( 2n + 1 ) d

n = 0, D = d

n = 1, D = 3d

n = 2, D = 5d

n = 3, D = 7d

The stranded
conductor has greater flexibility as compared to solid conductors.

Hollow
conductors

The diameter of
hollow conductor is large as compared to solid conductors for same current
capacity.

The corona loss is eliminated due to large diameter of conductor.

The
skin effect of hollow conductor is less as compared to stranded conductor.

The inductance of the hollow conductor is
less as compared to solid conductor.

As the diameter of conductor increases, it
exposes higher weight due to wind pressure and ice accumulated on the conductor
surface.

Bundle
conductors

It is defined as
the two or more than two conductors per phase.

They are used for transmitting
power for long distances. The sub conductors are separated by equal distance.